A Backhoe weighing 8 tons is on top of a flatbed trailer and heading east
on Interstate 70 near Hays, Kansas? The extended shovel arm is made of
hardened refined steel and the approaching overpass is made of
commercial-grade concrete, reinforced with 1 1/2 inch steel rebar spaced
at 6 inch intervals in a criss-cross pattern layered at 1 foot vertical
spacing.
Solve: When the shovel arm hits the overpass, how fast do you have
to be going to slice the bridge in half?? (Assume no effect for headwind
and no braking by the driver...) Extra Credit: Solve for the time and
distance required for the entire rig to come to a complete stop after
hitting the overpass at the speed calculated above.? Yes, you can neglect
friction.
I couldn't solve it either......but who cares the pictures are great
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